Helmet accessory attachment system

ABSTRACT

A helmet accessory attachment member includes a finger-actuatable lock configured to secure an accessory attachment member mount to a helmet mount as part of securing an accessory such as a mandible guard to a helmet. The lock includes a pivot arm with a rotation axis that is parallel to the helmet surface, and also includes one or more blocking surfaces on the pivot arm to engage with grooves on the helmet mount. The lock may be positioned on a slidable insert of the accessory attachment member.

FIELD

Aspects of the present disclosure relate generally to helmet assemblies,and more particularly to helmet accessory attachment systems.

DISCUSSION OF THE RELATED ART

Members of the military and law-enforcement often wear protectiveheadgear, such as helmets. Various helmet accessories are available toenhance safety and provide different functionalities, such as a faceshield or a mandible guard.

SUMMARY

According to one embodiment, a helmet accessory attachment systemincludes a helmet mount having a helmet-facing surface, and an accessoryattachment member having an accessory attachment member mount configuredto engage with the helmet mount such that the engagement of theaccessory attachment member with the helmet mount supports the accessoryattachment member from the helmet mount. The system also includes a lockto secure the accessory attachment member to the helmet, the lockincluding a pivot arm and a first blocking surface, and the pivot armhaving an unlocked position and a locked position. The pivot arm ispivotable about a pivot axis that is not perpendicular to thehelmet-facing surface of the accessory attachment member mount at thepivot axis location. When the pivot arm is in the locked position, thefirst blocking surface is positioned relative to a second blockingsurface on the helmet mount to prevent movement of the accessoryattachment member mount relative to the helmet mount.

According to another embodiment, a mandible guard attachment systemincludes a helmet mount having a helmet-facing surface, and a mandibleguard attachment member having a mandible guard attachment member mountconfigured to engage with the helmet mount such that the engagement ofthe mandible guard accessory attachment member mount with the helmetmount supports the accessory attachment member from the helmet mount.The system also includes a lock to secure the mandible guard accessoryattachment member to the helmet, the lock including a pivot arm and afirst blocking surface, and the pivot arm having an unlocked positionand a locked position, wherein the lock is positioned on the mandibleguard attachment member mount. When the pivot arm is in the lockedposition, the first blocking surface is positioned relative to a secondblocking surface on the helmet mount to prevent movement of theaccessory attachment member mount relative to the helmet mount.

According to a further embodiment, A helmet accessory attachment systemincludes a helmet mount having a helmet-facing surface, and a helmetaccessory attachment member having a slidable insert configured toengage with the helmet mount such that the engagement of the slidableinsert with the helmet mount supports the helmet accessory attachmentmember from the helmet mount. The system also includes a lock to securethe helmet accessory attachment member to the helmet, the lock includinga pivot arm and a first blocking surface, and the pivot arm having anunlocked position and a locked position, wherein the lock is positionedon the slidable insert. When the pivot arm is in the locked position,the first blocking surface is positioned relative to a second blockingsurface on the helmet mount to prevent movement of the slidable insertto the helmet mount. When the pivot arm is in the locked position, thefirst blocking surface protrudes from an underside of the slidableinsert.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings are not intended to be drawn to scale. In thedrawings, each identical or nearly identical component that isillustrated in various figures may be represented by a like numeral. Forpurposes of clarity, not every component may be labeled in everydrawing. Various embodiments of the invention will now be described, byway of example, with reference to the accompanying drawings, in which:

FIG. 1 is a left side perspective view of a helmet, a helmet accessoryattachment system, and a mandible guard according to one embodiment;

FIG. 2 is a front view of the embodiment shown in FIG. 1;

FIG. 3 is a left side view of the embodiment of FIGS. 1 and 2 with theaccessory attachment system shown attached to and removed from thehelmet;

FIG. 4 shows one embodiment of a helmet mount;

FIG. 5 shows an accessory attachment member engaged but not secured to ahelmet mount according to one embodiment;

FIG. 6 is a front view of an elongate slot and top and bottom undercutsurfaces;

FIG. 7 is a front view of an accessory attachment member mount with apivot arm in an unlocked position;

FIG. 8 is a perspective rear view of the arrangement of FIG. 7;

FIG. 9 is a front view of an accessory attachment member mount with apivot arm in a locked position;

FIG. 10 is a perspective rear view of the arrangement of FIG. 9;

FIG. 11 is an exploded view of an accessory attachment member accordingto one embodiment; and

FIG. 12 shows a mandible guard detached from one side of a helmet.

DETAILED DESCRIPTION

It should be understood that aspects of the invention are describedherein with reference to certain illustrative embodiments and thefigures. The illustrative embodiments described herein are notnecessarily intended to show all aspects of the invention, but ratherare used to describe a few illustrative embodiments. Thus, aspects ofthe invention are not intended to be construed narrowly in view of theillustrative embodiments. In addition, it should be understood thataspects of the invention may be used alone or in any suitablecombination with other aspects of the invention.

Various embodiments are described in connection with a helmet assembly,such as a military combat helmet. However, the invention is notnecessarily so limited, and may be employed with other types of helmets,particularly helmets suitable for high impact activities. For ease ofunderstanding, the helmet assembly is described in connection with amilitary combat helmet, which may be a ballistic or non-ballistichelmet.

Mandible guards may be permanently or removably mounted to helmets toprovide jaw and face protection from projectiles or other dangers.Applicant has recognized that the ability to conveniently attach andremove (partially or fully) a mandible guard to enable access to thelower half of the face may be helpful for comfort and safety inhigh-risk environments. Applicant has recognized that such functionalitymay be achieved with an attachment system that allows the mandible guardto be attached to only one side of the helmet such that the mandibleguard is free on the other side of the helmet. Additionally, someembodiments of attachment systems disclosed herein permit a wearer toconveniently attach, secure, unsecure, and/or remove a mandible guardfrom one side of a helmet using only one hand.

Attachment systems for mandible guards disclosed herein may include twoaccessory attachment members, one on each side of the helmet, and eachaccessory attachment member may be attached to the helmet at a helmetmount. In one embodiment, the mandible guard may be partially removedsuch that the mandible guard is attached to the helmet by only oneaccessory attachment member, and the mandible guard is movable away froma wearer's face. Such embodiments may provide the wearer full access tothe mouth area, which enables activities like eating, drinking, andspitting, without entirely removing the mandible guard. The arrangementalso may enable efficient reattachment of a second accessory attachmentmember to return the mandible guard to the protection position.

According to some embodiments disclosed herein, an attachmentarrangement is provided whereby a wearer can easily attach and secure anaccessory attachment member to a helmet mount. The attachment accessorymember is initially attached to the helmet mount by engaging a helmetaccessory attachment member mount with the helmet mount. For example,the accessory attachment member may include a slidable block that isinserted into an elongate slot of the helmet mount to initially attachthe accessory attachment member to the helmet. A finger-actuatable lockmay be used to secure the slidable block within the elongate slot. Thestructure of the lock may be such that unintentional disengagement ofthe lock is unlikely. The lock may include a pivot arm which allows forstraightforward, finger-actuatable unlocking so that the wearer, withoutthe use of a tool, can easily unlock the accessory attachment arm andremove the attachment accessory member from the slot to release theaccessory attachment arm from the helmet mount.

In some embodiments, the elongate slot may be any structure thatincludes an opening and a receiving area to receive a portion of theaccessory attachment member. For example, the elongate slot may includeany suitably shaped recess or cutout sized to accept and retain aportion of the movable member's outer periphery.

In some embodiments, the lock includes a protrusion with a firstblocking surface. When the lock is in a disengaged position, theaccessory attachment member mount is movable relative to the helmetmount. When the accessory attachment member mount is engaged with thehelmet mount and the lock is in the locked position, the first blockingsurface of the protrusion interacts with a second block surface of thehelmet mount to prevent movement of the accessory attachment memberrelative to the helmet mount. In some embodiments, the second blockingsurface is a restraint, a barrier, a narrowing channel, or otherimpediment which prevents motion of the accessory attachment membermount (such as a slidable block) toward the slot opening where theaccessory attachment member mount may be released from the helmet mount.

The first blocking surface of the lock may be fixed to a lock actuator,and the blocking surface may be movable to a locked position in whichthe blocking surface protrudes from an underside of the slidable blockin some embodiments. In some embodiments, the locking actuator is apivot arm that moves the lock between the locked and unlocked positionswithout the use of a tool. For the sake of clarity, the embodimentsherein are described with reference to a pivot arm, though otherconfigurations of a lock actuator are contemplated.

When the pivot arm is initially in the unlocked position, the pivot armmay be biased toward the unlocked position for a first part of therotation and toward the locked portion for a second part of therotation. When the pivot arm is initially in the locked position, thepivot arm may be biased toward the locked position for part of therotation and toward the unlocked position for a second part of therotation. Such an arrangement may help keep the pivot arm in itsexisting state until the wearer intentionally moves the arm to the otherstate. For example, the pivot arm may be biased toward the lockedposition by a biasing element such as a spring, a cantilever, or othersuitable device capable of applying a force to the pivoting member. Insome embodiments, the pivoting member may not be biased. In someembodiments, the pivot arm is not biased throughout an entire rotation,but instead encounters a protrusion or other impediment that requires athreshold force on the pivot arm to overcome.

When it is desired to mount the mandible guard (or other accessory) to ahelmet, a user positions the accessory attachment member mount, such aslidable block, in the opening of the elongate slot on the helmet mount.The slidable block is then moved into the elongate slot away from theopening until a stopping surface engages with the helmet mount toprevent further sliding inwardly. Once the stopping surface abuts themount, the user may rotate the pivot arm toward the locked position.

When the pivot arm is in the locked position, the first blocking surfaceof the lock engages with a corresponding groove in the elongate slot,and a blocking surface of the groove constrains the slidable block'smovement within the slot. This constraint secures the accessoryattachment member to the helmet mount and locks it into position.

To remove the accessory attachment member from the helmet mount, theuser pulls the pivot arm toward the unlocked position. Due to a biasingelement or other resistance, rotation of the pivot arm is resisted untila threshold force is achieved and/or a certain amount of rotationoccurs. When the blocking surface is disengaged from the correspondinggroove in the elongate slot, the slidable block may be slid toward theopening of the elongate slot and removed from the elongate slot. In someembodiments, this system permits a user to attach and remove theaccessory attachment member from the helmet mount using a single hand.

Turning now to the figures, FIGS. 1-2 show an embodiment of a helmetassembly 100, the assembly including one embodiment of an accessoryattachment system used to selectively attach a mandible guard 103 to ahelmet 105. The helmet 105 and/or mandible guard 103 may be militaryhelmets and/or be ballistic rated. For example, the helmet and/ormandible guard may meet at least ballistic threat level I, at leastballistic threat level IIA, at least ballistic threat level II, at leastballistic threat level IIIA, at least ballistic threat level III, and/orat least ballistic threat level IV, per the Ballistic Resistance of BodyArmor NIT Standard-0101.06 dated July 2008. Accessory attachment rails107 are attached to each side of the helmet in some embodiments, and mayinclude elastic cords, various protrusions and recesses, and/or othercomponents for mounting various accessories to the helmet.

The mandible guard attachment system includes helmet mount 108 anelongate slot 109 (see FIG. 6) within each rail 107. Accessoryattachment members 111 each include an accessory attachment member mount112, and each mount 112 includes a slidable insert 115 (see FIG. 7)which is slidingly insertable into elongate slot 109 via an opening 127(see FIG. 9). The slidable insert 115 is securable to the helmet mountby rotating a pivot arm 116 to a locked position, as discussed furtherbelow. The accessory attachment members 111 also include accessoryattachment member arms 114 which extend to a connection region with themandible guard 103.

FIG. 3 shows the mandible guard in two separate positions—removed fromthe helmet and secured to the helmet. To attach the mandible guard tothe helmet, the pivot arms 116 are pivoted upwardly (see arrow A) andthe slidable inserts 115 are slid (see arrow B) into the elongate slots109. Once the slidable inserts are inserted into the slots, theaccessory attachment members 111 and the mandible guard are supported bythe engagement of the accessory attachment members 111 with the helmetmounts 108.

The accessory attachment members may then be fully secured to the helmetmounts by pivoting the pivot arms 116 downwardly (see arrow C) untiltheir respective lock protrusions are inserted into correspondinggrooves in the rails 107. Grooves 117 in one rail 107 are shown in FIG.4. By inserting the lock protrusions 131, 133 into the grooves 117, eachslidable insert 115 is prevented from sliding in a direction toward theopenings 127 of the elongate slots 109, thereby fully securing theaccessory attachment member to the helmet mount. When in the lockedposition, the pivot arms may be substantially flush with an outersurface of the accessory attachment member so that the pivot arms do notpresent a snag hazard. An open or recessed area may be providedimmediately under the pivot arm so that a wearer can fit his or herfinger below the pivot arm when unlocking the pivot arm. The pivot armis illustrated as a substantially flat plate in some embodiments, butthe pivot arm may include other arrangements such as a curved surface, arod, or any other suitable arrangement. The lock, including the pivotarm, is positioned on the slidable insert 115 at a temple region of thehelmet in the embodiment shown in FIG. 1.

In the illustrated embodiment, two grooves 117 are arranged on each rail107 to correspond to two lock protrusions on the corresponding accessoryattachment member. Each groove 117 includes a blocking surface 118 thatprevents movement of the corresponding lock protrusion toward theopening of the elongate slot 109. In some embodiments, a single grooveand a single lock protrusion may be used. In other embodiments, three ormore grooves and corresponding lock protrusions may be used. The one ormore blocking surfaces 131, 133 of the helmet mount 108 do notnecessarily need to be formed within a groove, but may instead bepositioned on a protrusion.

FIG. 5 shows accessory attachment member 111 engaged with elongate slot109, but not secured as the pivot arm 116 is raised. To align the lockprotrusions of the pivot arm with the grooves of the helmet mount, theslidable insert 115 may include a stopping surface to limit how far theslidable insert can be moved along the elongate slot 109, as discussedfurther below.

The pivot arm 116 has a pivot axis 121 which is substantially parallelto the helmet surface that lies below the pivot axis in someembodiments. In the embodiment illustrated in FIG. 5, pivot axis 121 isalso parallel with a longitudinal direction of elongate slot 109.However, in some embodiments, the pivot axis may be perpendicular orotherwise orthogonal to the longitudinal direction of elongate slot 109while still being substantially parallel to the underlying helmetsurface. In this manner, for example, the pivot axis of pivot arm 116may be vertically oriented instead of having the horizontal arrangementillustrated in FIG. 5. For purposes of this description, the terms“vertical” and “horizontal” are used with reference to the orientationof the helmet in FIG. 2. In some embodiments, the pivot axis of pivotarm 116 may be oriented diagonally, that is, such that it has bothhorizontal and vertical components to its angle, while still beingsubstantially parallel to the underlying helmet surface. For purposesherein, the pivot axis being substantially parallel to the underlyinghelmet surface means that the an imaginary line extended from the pivotaxis forms an angle of no more than 25 degrees with a plane tangent tothe underlying helmet surface. For purposes herein, the pivot axis beingsubstantially parallel to the helmet-facing surface of the accessoryattachment member mount at the pivot axis location means that animaginary line extended from the pivot axis forms an angle of no morethan 25 degrees with the helmet-facing surface of the accessoryattachment member mount. In some embodiments, the pivot arm pivot axisis parallel with the to the underlying helmet surface and/or thehelmet-facing surface of the accessory attachment member mount.

In some embodiments, and particularly in embodiments where an elongateslot is integrally molded into the helmet, the pivot axis of the pivotarm may be parallel to a base surface of the elongate slot. In someembodiments, such as the embodiment shown in FIG. 5, the pivot axis isparallel to a helmet-facing surface of the accessory attachment membermount (e.g., the slidable insert).

FIG. 6 shows one embodiment of an elongate slot 109 in which theelongate slot 109 forms one portion of a sliding dovetail. The top andbottom surfaces 135, 137 of the slot 109 are undercut to form triangularrecesses that are capable of retaining corresponding portions on theaccessory attachment member 111 (See FIG. 7). This arrangement preventsthe accessory attachment member from being removed from the elongateslot 109 in any direction other than along the longitudinal direction ofthe slot. In this manner, when the slidable insert of the accessoryattachment member is inserted into the elongate slot 109, the engagementof the accessory attachment member with the helmet mount supports theaccessory attachment member from the helmet mount. In other embodiments,the recesses could include a semicircular or other suitably shapedrecess or cutout sized to accept and retain a portion of the outerperiphery of the slidable insert.

FIG. 7 shows a sliding insert 115 with a complementary shape to theelongate slot shown in FIG. 6. Pivot arm 116 is shown in the unlockedposition, and first and second lock protrusions 131, 133 are visible onthe underside of the pivot arm 116. With the pivot arm in the raised,unlocked position, the first and second lock protrusions 131, 133 do notprotrude from and underside surface 136 of the sliding insert 115, asmay be seen in FIG. 8.

FIGS. 9 and 10 show the lock in the locked position (e.g., with theticket arm lowered), with the first and second lock protrusions 131, 133protruding through openings 132, 134 in the underside surface 136 of thesliding insert 115. Blocking surfaces 141, 143 are positioned to contactcorresponding blocking surfaces of the grooves 117 positioned in thehelmet mount. With such an arrangement, when the lock protrusions 131,133 are in the locked position, the accessory attachment member isprevented from moving out of the elongate slot 109 in the elongate slotdirection.

A lock protrusion is considered to be positioned on the pivot arm evenif the protrusion is not directly attached to the portion of the pivotarm that the wearer grips. That is, protrusions that are connected tothe pivot arm assembly and rotate when the pivot arm rotates areconsidered to be included on the pivot arm.

A stopping surface 139 may be provide to limit how far into the elongateslot the accessory attachment member can be inserted. Such anarrangement can align the one or more blocking surface of the lock withthe grooves on the helmet mount in some embodiments. Additionally, thestopping surface may provide a consistent positioning of the mandibleguard on the helmet.

FIG. 11 shows an exploded view of accessory attachment member 111.Visible in this view is a bump 147 which holds the pivot arm in thelocked position by interacting with a corresponding bump (not shown) ona cylindrical portion 149 of the pivot arm to form a snap lock. The twobumps are constructed and arranged such that when the pivot arm is inthe locked position, little or no rotation is permitted until athreshold force is applied to the lever arm that is sufficient to moveone bump past the other. Similarly, to put the pivot arm into a lockedposition, the two bumps may require that the pivot arm the moved with atleast a threshold force. In other embodiments, bumps, otherprotuberances, or other components may be arranged such that there isresistance to moving the pivot arm away from the locked position, butthere is little or no resistance to moving the pivot arm to the lockedposition.

Pivot arm 116 may be pivotally attached to the slidable insert 115 witha cylindrical pin 151. A pin is not required however, and any othersuitable pivoting arrangement may be used. In some embodiments, insteadof a pivoting arrangement, a purely translational movement may be usedto put the accessory attachment member in a locked position.

The accessory attachment member arm 114 may be attached to the slidableinsert portion of the accessory attachment member with rivets 155, 157or any other suitable fastener(s). The connection of the arm 114 to anaccessory (e.g., mandible guard) may include two pivot arrangements 161,163 connected with an intermediate member 165.

In some embodiments, the user may be able to remove the accessoryattachment member 114 from the helmet mount on a first side of thehelmet 105 without removing the accessory attachment member from theother side of the helmet. In some embodiments, disengaging a single sideallows the mandible guard to hang from the helmet by the accessoryattachment member that remains attached, as may be seen in FIG. 12. Themandible guard 5 may be able to move in a variety of manners whileremaining attached to one side of the helmet. For example, the mandibleguard may have a hinged connection between the guard and the accessoryattachment member.

The use of “including,” “comprising,” “having,” “containing,”“involving,” and/or variations thereof herein, is meant to encompass theitems listed thereafter and equivalents thereof as well as additionalitems.

The above aspects and embodiments may be employed in any suitablecombination, as the present invention is not limited in this respect. Itshould also be understood that, unless clearly indicated to thecontrary, in any methods claimed herein that include more than one stepor act, the order of the steps or acts of the method is not necessarilylimited to the order in which the steps or acts of the method arerecited.

Having thus described several aspects of at least one embodiment of thisinvention, it is to be appreciated that various alterations,modifications, and improvements will readily occur to those skilled inthe art. Such alterations, modifications, and improvements are intendedto be part of this disclosure, and are intended to be within the spiritand scope of the invention. Accordingly, the foregoing description anddrawings are by way of example only.

What is claimed is:
 1. A helmet accessory attachment system comprising:a helmet mount having a helmet-facing surface; an accessory attachmentmember having an accessory attachment member mount configured to engagewith the helmet mount such that the engagement of the accessoryattachment member with the helmet mount supports the accessoryattachment member from the helmet mount; a lock to secure the accessoryattachment member to the helmet, the lock including a pivot arm and afirst blocking surface, and the pivot arm having an unlocked positionand a locked position; wherein the pivot arm is pivotable about a pivotaxis that is not perpendicular to the helmet-facing surface of theaccessory attachment member mount at the pivot axis location; andwherein when the pivot arm is in the locked position, the first blockingsurface is positioned relative to a second blocking surface on thehelmet mount to prevent movement of the accessory attachment membermount relative to the helmet mount.
 2. A helmet accessory attachmentsystem as in claim 1, wherein the pivot arm pivot axis is substantiallyparallel to the helmet-facing surface of the accessory attachment membermount at the pivot axis location.
 3. A helmet accessory attachmentsystem as in claim 1, wherein the pivot arm pivot axis is parallel tothe helmet-facing surface of the accessory attachment member mount atthe pivot axis location.
 4. A helmet accessory attachment system as inclaim 1, wherein the helmet mount includes an elongate slot, and theaccessory attachment member mount includes a slidable insert which isslidable within the elongate slot to engage the slidable insert with thehelmet mount.
 5. A helmet accessory attachment system as in claim 4,wherein the pivot arm pivot axis is parallel to a longitudinal directionof the elongate slot.
 6. A helmet accessory attachment system as inclaim 4, wherein the pivot arm is attached to the slidable insert.
 7. Ahelmet accessory attachment system as in claim 4, wherein the pivot armincludes a first lock protrusion, and the first blocking surface is onthe first lock protrusion.
 8. A helmet accessory attachment system as inclaim 4, wherein the pivot arm causes a first lock protrusion to rotatewhen the pivot arm rotates, and the first blocking surface is on thefirst lock protrusion
 9. A helmet accessory attachment system as inclaim 7, wherein the pivot arm further includes a second lockprotrusion, and the second lock protrusion includes a third blockingsurface such that when the pivot arm is in the locked position, thethird blocking surface is positioned relative to a fourth blockingsurface on the helmet mount to prevent movement of the accessoryattachment member mount relative to the helmet mount.
 10. A helmetaccessory attachment system as in claim 4, wherein the helmet mountincludes a rail and the rail includes the elongate slot.
 11. A helmetaccessory attachment system as in claim 4, wherein the lock includes asnap lock to hold the pivot arm in a locked position.
 12. A helmetaccessory attachment system as in claim 1, further comprising a mandibleguard attached to the accessory attachment member.
 13. A helmetaccessory attachment system as in claim 1, further comprising a helmet,and wherein the helmet mount is attached to the helmet.
 14. A helmetaccessory attachment system as in claim 1, further comprising a secondhelmet mount having a second helmet-facing surface, the second helmetmount being positioned on a lateral side of the helmet opposite to thehelmet mount; a second accessory attachment member having a secondaccessory attachment member mount configured to engage with the secondhelmet mount such that the engagement of the second accessory attachmentmember with the second helmet mount supports the second accessoryattachment member from the second helmet mount; a second lock to securethe second accessory attachment member to the helmet, the second lockincluding a second pivot arm and a third blocking surface, and thesecond pivot arm having an unlocked position and a locked position;wherein the second pivot arm is pivotable about a second pivot axis thatis not perpendicular to the second helmet-facing surface of the secondaccessory attachment member mount at the second pivot axis location; andwherein when the second pivot arm is in the locked position, the thirdblocking surface is positioned relative to a fourth blocking surface onthe second helmet mount to prevent movement of the second accessoryattachment member mount relative to the second helmet mount.
 15. Amandible guard attachment system comprising: a helmet mount having ahelmet-facing surface; a mandible guard attachment member having amandible guard attachment member mount configured to engage with thehelmet mount such that the engagement of the mandible guard accessoryattachment member mount with the helmet mount supports the accessoryattachment member from the helmet mount; a lock to secure the mandibleguard accessory attachment member to the helmet, the lock including apivot arm and a first blocking surface, and the pivot arm having anunlocked position and a locked position, wherein the lock is positionedon the mandible guard attachment member mount; and wherein when thepivot arm is in the locked position, the first blocking surface ispositioned relative to a second blocking surface on the helmet mount toprevent movement of the accessory attachment member mount relative tothe helmet mount.
 16. A mandible guard attachment system as in claim 15,wherein when the pivot arm is in the locked position, the first blockingsurface protrudes from the mandible guard attachment member mount.
 17. Amandible guard attachment system as in claim 15, wherein: the helmetmount includes an elongate slot; the mandible guard attachment membermount includes a slidable insert slidable in the elongate slot; and whenthe pivot arm is in the locked position, the first blocking surfaceprotrudes from an underside of the slidable insert.
 18. A mandible guardattachment system as in claim 17, wherein the slidable insert isslidable into the elongate slot at a temple region of the helmet, andthe lock is positioned on the slidable insert at the temple region ofthe helmet.
 19. A helmet accessory attachment system as in claim 15,further comprising a helmet, and wherein the helmet mount is attached tothe helmet.
 20. A helmet accessory attachment system comprising: ahelmet mount having a helmet-facing surface; a helmet accessoryattachment member having a slidable insert configured to engage with thehelmet mount such that the engagement of the slidable insert with thehelmet mount supports the helmet accessory attachment member from thehelmet mount; and a lock to secure the helmet accessory attachmentmember to the helmet, the lock including a pivot arm and a firstblocking surface, and the pivot arm having an unlocked position and alocked position, wherein the lock is positioned on the slidable insert;wherein when the pivot arm is in the locked position, the first blockingsurface is positioned relative to a second blocking surface on thehelmet mount to prevent movement of the slidable insert to the helmetmount; and when the pivot arm is in the locked position, the firstblocking surface protrudes from an underside of the slidable insert. 21.A helmet accessory attachment system as in claim 20, wherein the helmetmount includes an elongate slot into which the slidable insert isslidable.
 22. A helmet accessory attachment system as in claim 20,wherein the pivot arm pivot axis is substantially parallel to thehelmet-facing surface of the accessory attachment member mount at thepivot axis location.
 23. A helmet accessory attachment system as inclaim 20, wherein the pivot arm pivot axis is parallel to thehelmet-facing surface of the accessory attachment member mount at thepivot axis location.
 24. A helmet accessory attachment system as inclaim 20, further comprising a helmet, and wherein the helmet mount isattached to the helmet.